kckndrgn,
One thing to consider for lighting: My shop is almost exactly the same size as the one your are building. I have two 12x20 doors on either end which cover two of the end light banks when up. Not a biggee with daylight making up the difference but, the center of the garage was dim with the original florescents.
I swapped over to LED tubes and the increase in light was noticeable. Over the last year, I have accumulated some like-new 48" fluorescent fixtures that I simply swapped over to LED tubes. I have six original fixtures and have installed four more with two last ones at the far end. The difference is UNBELIEVABLE. I'll be able to work in there over winter and have plenty of light for these tired old eyes.
You can go LED much cheaper than the $80 per fixture cost you see at places like Home Depot. I have been picking up sweet take-outs for around $12 a fixture and Costco has LED bulbs for $18 a pair, or $30 all-up for the converted fixture.
In a couple locations, like over power tools, a tool chest, and the coffee maker/kicthen counter, I am hanging can drop-in fixtures with simple LED PAR 30 or bigger 75 watt floods, mounted on wood frames and hung between my exposed trusses. I'll have six around the perimeter of the shop in the "dark" areas.
I know you are thinking about all that stuff now but with two 20 amp circuits, you can really light up a shop that size with LEDs. I am stunned at the difference thus far.
My lights are still fairly warm, about 4000K so colors are true and bright without giving you eye fatigue when you look up at the fixtures. Spread your lighting out. I saw one guys shop where he put in some special order 10,000 lumen fixtures that hurt your eyes terribly. He has had to put grates on them to protect his eyes by blocking some of the horizontal glare. I ended up putting my sunglasses back on when I visited!
Have fun planning...